After you file

Are you using the Desktop program to amend?  I think you have to.  In the Desktop program click on the Personal Info tab.  First tab on top left.  Then scroll down to #3 and  check the NO box that someone can claim you.  See screen shot.

 

Did you not get the Recovery Rebate Credit (3rd Stimulus) because you said you were a dependent?  And nobody claimed you as a dependent?  

 

O Dependent can be claimed.jpg